Exception handling through custom components

Please let me know if there is any info about handling exceptions using custom components?
Please share if any sample references are available.
Many Thanks.

You should in fact never explicitly catch RuntimeExceptions or Errors, unless you have a really, really good excuse. RuntimeExceptions are a sign of a "developer error" and needs to be bugfixed by just adding solid prechecks, so let them go. Errors are in any way unrecoverable, so let them go as well.
To avoid ArrayIndexOutOfBoundsException just add a precheck on the array length and so on.

Similar Messages

Exception handling in Custom Login procedure

Hi,
I have a custom login procedure. Now instead of handling the possible exceptions in a custom way too, I want to use the syntax of the exception handling API (probably the one in the PDK) the default login procedure uses. Can someone point me to the values the default login procedure uses?
Thanks, Tony

Tony,
The default login page (the source of which is now unwrapped in 3.0.0), uses the following snippet of code to report the errors:
if p_error then
wwerr_api_error_ui.show_inline_html;
end if;The errors are stacked when the ls_login procedure is executed, and the next time the login page is called up, it just displays the stacked errors.

Exception handling in custom JSF components

Hi,
Im trying to develop a JSF custom component, intended for professional use ;-)
I want to ask you for a definitive and solid way to handling exceptions in the encode/decode methods.
JSF books dont say too much about that.
For example, if your code may produce an ArrayIndexOutOfBoundsExceptions, how will you handle it? Will you use FacesException, JSFException, JSPException, ServletException, or what?
I find two interesting discussions concerning this, but I want to hear expert voices:
http://forums.sun.com/thread.jspa?forumID=427&threadID=528752
http://forums.sun.com/thread.jspa?forumID=427&threadID=528227
Thanks!

You should in fact never explicitly catch RuntimeExceptions or Errors, unless you have a really, really good excuse. RuntimeExceptions are a sign of a "developer error" and needs to be bugfixed by just adding solid prechecks, so let them go. Errors are in any way unrecoverable, so let them go as well.
To avoid ArrayIndexOutOfBoundsException just add a precheck on the array length and so on.

Exception Handling with Custom Tags/Exceptions

Hello all --
 I'm looking for some guidance in handling Custom errors in my app. I can't
 seem to find the message string of my custom exception when trying to call
 my JSP Error page. I'm consistently getting:
 javax.servlet.jsp.JspTagException: runtime failure in custom tag
 'CalendarHandler' .
 I am using custom JSP tag libraries to process logic on my EJBs. When I
 reach an error in business logic I raise a custom exception and propogate
 this back up to doStartTag:
 public int doStartTag() throws JspException {
 CalendarProcessor cp = new CalendarProcessor();
 try {
 String eventAction = getEventID();
 // pageContext contains information for the JSP;
 // Initialize the page with the current context and session
 cp.init(pageContext.getServletContext(), pageContext.getSession());
 HttpServletRequest req = (HttpServletRequest)pageContext.getRequest();
 cp.processRequest(req, eventAction );
 } catch (CalendarException ce) {
 throw new JspException(ce.getMessage());
 return SKIP_BODY;
 Then, in my JSP, I am enclosing the TagHandler in a try...catch block; I
 can't catch CalendarException because it is Throwable and conflicts with
 JspException.
 <% try { %>
 <gtc:CalendarHandler eventID="updatecal"/>
 <% } catch (Exception e) {
 throw e instanceof JspException ? (JspException) e : new
 JspTagException(e.getMessage());
 %>
 many thanks in advance!
 s.


I could not tell what the problem was that you were describing. Could you
 clarify?
 Cameron Purdy
 [email protected]
 http://www.tangosol.com
 WebLogic Consulting Available
 "Shari" <[email protected]> wrote in message
 news:[email protected]...
 > Hello all --
 >
 > I'm looking for some guidance in handling Custom errors in my app. I can't
 > seem to find the message string of my custom exception when trying to call
 > my JSP Error page. I'm consistently getting:
 > javax.servlet.jsp.JspTagException: runtime failure in custom tag
 > 'CalendarHandler' .
 >
 > I am using custom JSP tag libraries to process logic on my EJBs. When I
 > reach an error in business logic I raise a custom exception and propogate
 > this back up to doStartTag:
 >
 > public int doStartTag() throws JspException {
 >
 > CalendarProcessor cp = new CalendarProcessor();
 >
 > try {
 >
 > String eventAction = getEventID();
 >
 > // pageContext contains information for the JSP;
 >
 > // Initialize the page with the current context and session
 >
 > cp.init(pageContext.getServletContext(), pageContext.getSession());
 >
 > HttpServletRequest req = (HttpServletRequest)pageContext.getRequest();
 >
 > cp.processRequest(req, eventAction );
 >
 > } catch (CalendarException ce) {
 >
 > throw new JspException(ce.getMessage());
 >
 > }
 >
 > return SKIP_BODY;
 >
 > }
 >
 > Then, in my JSP, I am enclosing the TagHandler in a try...catch block; I
 > can't catch CalendarException because it is Throwable and conflicts with
 > JspException.
 >
 > <% try { %>
 >
 > <gtc:CalendarHandler eventID="updatecal"/>
 >
 > <% } catch (Exception e) {
 >
 > throw e instanceof JspException ? (JspException) e : new
 > JspTagException(e.getMessage());
 >
 > }
 >
 > %>
 >
 > many thanks in advance!
 >
 > s.
 >
 >
 >
 >
 >
 >
 >

Handling exception in custom components

Hello,
Is there any info about handling exceptions in custom components? I would like to expose some exceptions to the Livecycle process.
Thank you

I have faced this situation for a while and found solution.
1.Create your custom Exception say (custom exception)
2. Set the properties like errorcode,errormessage, and throwable (if u want to bubble up the exceptions).
3. Create a custom object to hold the results (i.e like a java bean)
4. In your custom component methods just return the custom object and set exception as a property.
for e.g.
public class CustomReturn {
private String result;
private CustomException exception;
//getters & setters
public class CustomException {
private int errorCode = -1;
private String errorMessage;
private Throwable error;
//getters & setters
public class CustomClass {
public CustomReturn testValue() {
CustomReturn returnValue = new CustomReturn();
try {
//perform operations
catch(Exception ex) {
CustomException cex = new CustomException ();
cex .setErrorCode(1000);
cex .setErrorMessage(ex.getMessage());
cex .setErr(ex);
returnValue .setException(cex);
return returnValue;
return returnValue;
As you see , you can check for the exception in your return type using the bean property.
This will overcome the limitation of not able to retrieve the error stack incase of errors with default livecycle components.
Hope this helps.
-Senthil

Custom code as an exception handler not working.

Hi,
I worked on Custom Handler for unauthorized access to a taskflow following the link below and it worked. But a special case in this doesn't work.
http://download.oracle.com/docs/cd/E14571_01/web.1111/b31974/taskflows_complex.htm#ADFFD22602
Scenario-1: I have a link that opens an unauthorized taskflow as blank page. I tried the solution of custom handler and am able to display message or display error page --- WORKS FINE
Scenario-2: I have a link that opens an unauthorized taskflow in a pop-up as blank page. The above solution doesn't work. I tried displaying SOPs but nothing gets print --- DOESN'T WORK.
Details:
The custom handler doesn't work with Pop-ups. I have an unauthorized taskflow that gets called inside a pop-up using a link. Being an unauthorized user, I click on the link and it pops-up with a blank page. As per the custom handler it is supposed to display error-page. But it doesn't.
I tried displaying SOPs inside the handleException method and nothing prints. The exception handler is unable to catch the exception. If this use-case throws some exception, my exception handler would have handle it but it doesn't raise any exception.
Is this something issue that I need to discuss with FMW team?
Any workaround for this would be of great help.
Code Sample:
public void handleException(FacesContext facesContext, Throwable throwable,
PhaseId phaseId) throws Throwable {
String errorMessage = throwable.getMessage();
if (errorMessage != null && errorMessage.indexOf("ADFC-0619") > -1) {
setEL("#{sessionScope.errorMessage}",
"You are not authorized to view this page.");
ExternalContext externalContext =
facesContext.getExternalContext();
externalContext.redirect("ErrorPage");
} else {
super.handleException(facesContext, throwable, phaseId);
Thanks
Raza

Hi Frank,
This scenario is not specific to a particular TaskFlow. In General, there are links in some views, that invokes taskflows and a particular user may not have permission to that TaskFlow. In this scenario, I am not sure where I need to define the method or router. And Hence I registered the Custom Exception Handler as a service as per the documentation.
But the logic in documentation doesn't work with Pop-ups.
Thanks
Raza

How to handle events between two custom components?

Hi ,
i want to handle events between two custom components, example if an event is generated in one custom component ,and i want to handle it any where in the application.....can any one suggest me any tutorial or meterial in this concept...
thanks

Events don't really go sideways in ActionScript by default. They bubble upward. If you want to send an event sideways, you will probably have to coordinate with something higher up in the event hierarchy. You can send the event to a common ancestor, and then pass it down the hierarchy as a method argument.
Another option is to use a framework that supports Injection. There are a number around these days. The one I'm most familiar with is Mate, which allows you to handle events and inject data in MXML. Mate is meant to be used as an MVC framework, and you may want to look into it if your application is complex, but you can also use it to coordinate global event handling if you don't need that level of structure.

How to Handle Automatic Skip Property of Item in Oracle Forms through Custom.pll or from other methods

Hi All,
How to Handle Automatic Skip Property of Item in Oracle Forms through Custom.pll or from other methods.
This is a enhancement requirement.
When ever user enter value in field 1 then automatically cursor should go to next field.

Hello Bobb,
You can create a trigger(when-list-changed) for each list item where you could:
1.recreate the record groups and then use POPULATE_LIST so you can hide the selected values. In forms builder online help there are some good examples about create record groups dynamically.
or
2.you can perform a validation instead of hiding the selected values. If the values is already selected the display a message 'Value already selected....'
Second option is much faster(only an 'if clause')
Hope this helps.
Regards,
Alex

Implementing Exception Handling Application Block in custom web parts, event receivers

hi,
I am currently implementing try {} catch(Exception expp) { throw expp;} to handle exceptions in my intranet appln.
I have several custom web parts, event receivers, few console applciations as timer jobs etc. If i want to implement a robust exception handling what should be the approach. by searching, i saw, ms patterns n practices provides the
appln blocks.
But I think[ pls correct me if i am wrong ] those appln blocks are meant for asp.net applns ONLY.
if not, anyone has implemented those appln blocks in SP development? if yes, can anyone provide one sample / link to implement Exception Handling in SP.
help is appreciated!

Hi,
Here are some articles for your reference:
Handling Error Centrally in a SharePoint Application
http://www.codeproject.com/Articles/26236/Handling-Error-Centrally-in-a-SharePoint-Applicati
Using Microsoft Enterprise Library Application Block in SharePoint
http://www.codeproject.com/Articles/21389/Using-Microsoft-Enterprise-Library-Application-Blo
Exception Handling in SharePoint
http://spmatt.wordpress.com/2012/02/01/exception-handling-in-sharepoint/
Best Regards
Dennis Guo
TechNet Community Support

How to handle ADF_FACES Errors/Exceptions and display customized message.

Hi All,
My question here is, 
Is there any way to handle the validation/PPR kind of run time exceptions/errors. I have tried to handle these errors by extending the lifecycle and overridden the reportErrors method. But this method is being called in the PREPARE_RENDER phase. But the exception is happening in the JSF_PROCESS_VALIDATIONS phase. I have tried to handle the exceptions in the custom PagePhaseListener. But these exceptions could not be handled in the custom PagePhaseListener.
I would like to display a customized message to the user instead of displaying the PPR exception.
The details are given below.
I have a use case related to the security like if there is a drop down list in a page. Drop down list is having a af:validateRegExp component which allows only alphabets. Dropdown is populating alphanumeric values.
One option is selected in the drop down list and submitted the value with the help of the commondbutton.
With the help of some tools, we modified the submitted value(index of the list submitted) to some alphabets.
Its throwing some validation exception. Some of the statements are given below.
<UIXRegion> <_warn> Error processing viewId: /Validate_TF/validate URI: /validate.jsff actual-URI: /validate.jsff.
java.lang.NumberFormatException: ADF_FACES-60034:SelectOne could not convert index 0asd
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase PROCESS_VALIDATIONS 3
<RegistrationConfigurator> <handleError> ADF_FACES-60096:Server Exception during PPR
displaying a popup dialog with error message like:
ADF_FACES_60034:could not convert index
ADF_FACES_60097:server exception
ADF_FACES_60096: some exception occurred during PPR,
I don't want to show these kind of messages to user. Please suggest me whether is it possible or not.
Thanks in advance.
Regards,
SatishRaj Dasari.

Hi,
Try reading one of Franks post :
[url https://blogs.oracle.com/jdevotnharvest/entry/extending_the_adf_controller_exception_handler]
Nigel

EDT custom exception handler

Hi,
Is there any posibility to add custom exception handler to EDT? I'm thinking to implement an automatic feed-back from a client aplication. When an exception occurs in EDT it will automatically send to server. The problem is that unsigned webstart application have no permissions to call Thread.setUncaughtExceptionHandler() on EDT.
Is there any workaround?
Anton

Hi,
Is there any posibility to add custom exception handler to EDT? I'm thinking to implement an automatic feed-back from a client aplication. When an exception occurs in EDT it will automatically send to server. The problem is that unsigned webstart application have no permissions to call Thread.setUncaughtExceptionHandler() on EDT.
Is there any workaround?
Anton

Problems with Custom Exception Handler

Hi,
I have defined a custom exception handler for my workflow (WebLogic Platform
7).
I have a workflow variable called 'count' , which gets incremented for every
time an exception occurs.
The exception handler checks if the count is less than 3(using evaluate
condition),
if yes then it executes the action "Exit Execption Handler and retry"
else
it executes the action "Exit Execption Handler and continue"
The Workflow simply hangs, nothing on the console , the worklist from which
i call it hangs too.
Has anyone managed to use this kind of exception handling?
Thanks in advance,
Asif

bill0 wrote:
> Thanks for all the help but still no luck.
>
> The directory is d:\wSites\GBMain\html\CFMS> and I am
mapped to it as x:\CFMS.
> Most of the cfm files are in CFMS but Application.cfm is
1 directory up in
> html. I have tried misscfm.cfm in both html and CFMS but
had no luck having it
> find a non existant template referred to in a cfinclude
or a form's action
> attribute. The default ColdFusion error handler is what
shows. The missing
> template handler box says /misscfm.cfm. Misscfm.cfm is
text followed by a
> <cfabort>. We use ColdFusion MX6.1
>
> I hope that is enough information to figure what am I
missing and/or doing
> wrong.
>
>
Is the 'misscfm.cfm' file somewhere in the
'd:\wSites\GBMain\html\CFMS\'
directory. I will presume this is the 'web root' as defined
in your web
server (IIS or Apache or built-in or ???). The missing
template handler
file needs to be in the ColdFusion root. This is going to be
a
directory such as
'{drive}:\JRun4\servers\{server}\cfusion-ear\cfusion-war\misscfm.cfm'
for J2EE flavors OR '{drive}:\CFusionMX\wwwroot' for Standard
I think.
It has been a very long time since I have dealt with
Standard.
This is probably completely different from the above web
root. That is
the point I am trying to get across. ColdFusion has TWO roots
where it
will look for a CFML file. But the Missing and Sitewide
templates can
only be in the ColdFusion root listed above, they will not
work in the
web root.
HTH
Ian

Exception Handling In Struts, Declarative, programatic and customized excep

hello .
I'm workingon exception handling in struts , i executed the gobal exceptions.
In glabal exception handling , one will not get the root cause of exception , rather we print the message from resource bundle.
How to get the root cause of exception in jsp page.
Give me sample code to deal with ExceptionHandler claas.
Thank u
Roshu

Hi ,
I am in the same situation. Global exception is working fine in my struts application . But I need to show the exception stack trace also in the screen whenever the exception occurs.Can anyone please provide me a sample code to deal with ExceptionHandler class ?
Thanks in advance...
Regards,
BG

Custom components handling during Portal upgrade from 7.0 to 7.3

Greetings,
I started the upgrade of our development portal from version 7.0 to 7.3. I'm stuck in the configuration step when the upgrade program asks what to do with the custom java components found in the system.
I have 8 components for which I can only select Scan inbox or Remove. The problem is that I would like to keep them as-is but the option Keep does not appear in the combo box.
Does anybody have an idea about how to keep those components as they are?
thank you in advance,
Sébastien

Even i am running into same issue where it doesn't show the option to keep the custom components. Can i know how did you fix the issue?

Exception handling within a value-binding expression

Hi all,
Forgive me if this question seems odd, but I am a long-time Struts developer, new to JSF.
In Struts, exception handling was easy because all requests were funnelled through some subclass of Action. Exception handling could effectively be consolidated into one spot by applying the template-method pattern.
Of course, with JSF, this is not possible because method names in value-binding and action-binding expressions can be chosen arbitrarily. For this reason, I am exploring aspect-oriented (and other) techniques for consolidation JSF exception handling into one spot, but rather than focus too intently on that, it's clear that I first need the ability to forward to an error page when an exception is encountered in a value-binding or action-binding expression.
For action-binding expressions, ExternalContext.dispatch("<view id>"); seems to work quite well, but I am unable to make the same work when in the context of a value-binding expression. This is probably attributed to the fact that at that point, I am in an entirely different phase of the JSF request processing lifecycle.
What I'm looking to know is if anyone has a reliable means of forwarding to an error page within the context of a value-binding expression. Better yet, does anyone know a reliable way of forwarding to another view regardless of what phase you are in?
If it makes a difference (and I think it does) the error page uses JSF as well, and uses the same layout (provided via custom tags courtesy of JSP 2.0 tag files), so some view components would have the same name as the page which encountered the error. This seems to get in the way of me simply defining the error page for a 500 in my web deployment descriptor.
Thanks in advance to anyone with a working suggestion.
-Kent

Let me pose a purely hypothetical use case to demonstrate the problem:
Imagine a page in an HR app, employeeDetails.jsp, that displays an always-up-to-date combo box which lists employee names and IDs. onChange triggers a form submit with the intention of simply posting back to this page, with various text boxes, etc. below updated to show all information for the selected employee.
Obviously, with the requirement that the combo box always be up to date, it's clear that the getter invoked by the value-binding expression must access the database (not directly of course, but via a facade, application, then data-access layer). Any unexpected and unchecked exception in this chain would propagate back up to the getter method on the backing bean. I need to, at that point, log the exception (trivial) and forward to a user-friendly error page.
I suppose I could put some contraint on myself that data access is only performed within ActionEvent handlers, but I'm not sure that's consistent with the JSF model in general, in fact it almost seems Struts-like in that I'd have to invoke some action before loading this form to build the up-to-date list for the combo box, shove it in request scope, where it's then available to the page indicated by the navigation rules. Submission of the form on the page in question would also need to result in rebuilding the up-to-date list. Now we're looking at firther propagation of code. I want to avoid this, so I am looking for a better way.

Exception handling through custom components

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